Art Project Girl - When I do the original image file upload, I make sure it is a large, hi-res file. Blogger will always insert a small version of it into your blog. But, after publishing, when you click (or your visitors click) on the embedded image, it should take the visitor/you to a blank web page with only the larger version of the embedded image. Make any sense?

If you are already uploading hi-res files. . . It could be your internet browser/machine.